Microbiome Bacteria Trigger Heritable Immune Defense Against Intracellular Pathogens in C. elegans
Researchers identified a bacterium (Stenotrophomonas indicatrix JUb19) in the microbiome that activates immune defenses against intracellular pathogens in C. elegans worms without requiring actual infection. The bacterial single-stranded RNA triggers this response and also produces metabolic changes that enhance defense against viruses and other pathogens. The protection is inherited by offspring but reduces parental fitness, revealing how microbiome signals can program immunity across generations.
A study published on bioRxiv demonstrates that a naturally occurring microbiome bacterium can pre-activate immune responses against intracellular pathogens in Caenorhabditis elegans. The bacterium Stenotrophomonas indicatrix JUb19 induces the Intracellular Pathogen Response and broader metabolic remodeling without requiring infection, with bacterial single-stranded RNA identified as the key signaling molecule. Exposure to JUb19 reduces susceptibility to both viral and microsporidian pathogens and confers inherited protection to unexposed offspring, though this comes at a fitness cost to parents. These findings establish a novel mechanism by which microbiome-derived RNA can program heritable immunity against intracellular pathogens, suggesting that microbial exposure shapes host defense across generations through both immune and metabolic pathways.
What's missing
The study's limitations and open questions include: whether this phenomenon occurs in other organisms beyond C. elegans; the specific molecular mechanisms by which bacterial RNA triggers the Intracellular Pathogen Response; whether the fitness cost to parents is reversible or permanent; and the ecological conditions under which this microbiome-host interaction naturally occurs in wild populations.
What different sources said
- bioRxivCenter
Microbiome-Derived RNA Promotes Heritable Defense Against Intracellular Pathogens in Caenorhabditis elegans
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